Features: Made of food-grade plastic, it is durable, lightweight and washable. Built-in clear sealing rings, effectively prevent leakage and heat preservations. The best replacement for vacuum flask and mugs. Suitable for outdoor activities such as cycling, camping, hiking, mountain climbing, etc. Suitable for 4.5cm (1.77inch)/5cm (1.97inch)/7cm (2.75inch) bottle Mouth Diameter, please pay attention to the size specifications before purchasings. Specifications: Material: Plastic Suitable for Bottle Mouth Diameter: 4.5cm (1.77inch)/5cm (1.97inch)/7cm (2.75inch) Package Includes: 1x Vacuum Flask Lid note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.